DAPP画室/书画/字画古董拍卖竞拍抢拍商城系统开发(案例设计)/项目逻辑/成熟技术/方案介绍/源码说明

简介: 智能合约是DAPP的核心组成部分,它是一种自执行的计算机代码,It can ensure that any transaction is validated and executed.智能合约提供了一种区块链上的可编程机制,通过编写代码,将一系列的条件和操作映射到智能合约中,To achieve management and control of data and transactions on the blockchain.

  智能合约是DAPP的核心组成部分,它是一种自执行的计算机代码,It can ensure that any transaction is validated and executed.智能合约提供了一种区块链上的可编程机制,通过编写代码,将一系列的条件和操作映射到智能合约中,To achieve management and control of data and transactions on the blockchain.

  function burn(

  int24 tickLower,

  int24 tickUpper,

  uint128 amount

  )external override lock returns(uint256 amount0,uint256 amount1){

  //先计算出需要移除的token数

  (Position.Info storage position,int256 amount0Int,int256 amount1Int)=

  _modifyPosition(

  ModifyPositionParams({

  owner:msg.sender,

  tickLower:tickLower,

  tickUpper:tickUpper,

  liquidityDelta:-int256(amount).toInt128()

  })

  );

  amount0=uint256(-amount0Int);

  amount1=uint256(-amount1Int);

  //注意这里,移除流动性后,将移出的token数记录到了position.tokensOwed上

  if(amount0>0||amount1>0){

  (position.tokensOwed0,position.tokensOwed1)=(

  position.tokensOwed0+uint128(amount0),

  position.tokensOwed1+uint128(amount1)

  );

  }

  emit Burn(msg.sender,tickLower,tickUpper,amount,amount0,amount1);

  }

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